Ce3+‐Activated Photoluminescence in the BaO ‐ SrO ‐ SiO2 System: I . Crystalline Phases

Abstract

All single phase regions (compounds and solid solutions) in the normalBaO‐normalSrO‐SiO2 system were activated with 0.01 mole percent (m/o) Ce3+ (with equimolar amounts of Li+, Na+, or K+ added to compensate charges) and the resulting ultraviolet excitation and emission spectra were characterized. Brightest phosphors were obtained from the solid solution phases in the BaSiO3‐SrSiO3 and Ba2SiO4‐Sr2SiO4 systems at the approximate compositions of false(Ba0.8,Sr0.6false)SiO3:Ce3+ , K+ and false(Ba0.2,Sr0.8)2SiO4:Ce3+ , Li+, respectively. All phosphors exhibit a peak emission wavelength at approximately 390 nm with slight variations resulting from compositional changes.

Luminescence properties of Ce3+-activated alkaline earth silicon nitride M2Si5N8 (M=Ca, Sr, Ba) materials

“…Considering the similar structure with Sr 2 Si 5 N 8 , a larger difference in the ionic radius between Ce 3+ and Ba 2+ (20-26% as compared to 9-13% for the difference between Ce 3+ and Sr 2+ ) is considered to be the main reason for the lower solubility of Ce 3+ in Ba 2 Si 5 N 8 . This very low solubility of Ce 3+ can also be found for heterovalent Ce-substitution in Ba 3 (PO 4 ) 2 and Ba-silicate compounds [18,19]. The Ce 3+ , Li + co-doped M 2 Si 5 N 8 (M ¼ Ca, Sr, Ba) powders have daylight color varying from light to deep yellow-green due to absorption bands superimposed in the blue range (400-450 nm) in the reflectance spectra (Fig.…”

A green-yellow emitting oxyfluoride solid solution phosphor Sr2Ba(AlO4F)1−x(SiO5)x:Ce3+ for thermally stable, high color rendition solid state white lighting

“…Ce 3+ -substituted (Sr,Ba) 2 SiO 4 results in weak blue emission, which we have not observed. 38 For all compositions, the amount of substituted Ce 3+ was held constant corresponding to the optimal amount found for…”

The luminescent properties and crystal structure of Sr(1.5‐x)‐(1.5y)Mg0.5SiO4:xEu2+,yCe3+ blue phosphor synthesized by co‐precipitation method

“…Compared with the luminescent characteristics of Sr 1.496 Mg 0.5 SiO 4 :0.004Eu 2 + phosphor (Figure ), it can be seen that the excitation peak intensity at 350 nm increases significantly, and the emission spectrum shows blue emission centered at 413 nm corresponding to 4f 0 5d 1 → 4f 1 transition of Ce 3 + ; an intense emission centered at 463 nm is attributed to the 4f 6 5d 1 → 4f 7 transition of Eu 2 + ions. Based on the previously reported excitation wavelength of Ce 3 + in Sr 2 SiO 4 , it can be deduced that possible energy transfer from Ce 3 + to Eu 2 + could be expected in this co‐doped sample because of the overlap between the emission spectrum of the sensitizer (Ce 3 + ) and the excitation spectrum of the activator (Eu 2 + ).…”

“…in Sr 2 SiO 4 , [26] it can be deduced that possible energy transfer from Ce 3+ to Eu 2+ could be expected in this co-doped sample because of the overlap between the emission spectrum of the sensitizer (Ce 3+ ) and the excitation spectrum of the activator (Eu 2+ ). Figure 7 shows the luminescent properties of Sr (1.496-1.5y) Mg 0.5 SiO 4 :0.004Eu 2+ ,yCe 3+ (y = 0.0005, 0.0010, 0.0015 and 0.0020), and the inset to Figure 7 represents the change in the emission intensity at 413 and 463 nm, respectively.…”